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| author | Andy Lutomirski <luto@amacapital.net> | 2014-11-21 13:26:07 -0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-12-06 15:14:50 +0100 |
| commit | c50db3a5b930ef107cf6df611e729032e69de350 (patch) | |
| tree | fa7658a88b2f2e7d4ba73a83aef29307346ade65 /kernel | |
| parent | 868b19cb0314da9725ec108ec6abb082965cd0c2 (diff) | |
| download | lwn-c50db3a5b930ef107cf6df611e729032e69de350.tar.gz lwn-c50db3a5b930ef107cf6df611e729032e69de350.zip | |
uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY_RESUME
commit 82975bc6a6df743b9a01810fb32cb65d0ec5d60b upstream.
x86 call do_notify_resume on paranoid returns if TIF_UPROBE is set but
not on non-paranoid returns. I suspect that this is a mistake and that
the code only works because int3 is paranoid.
Setting _TIF_NOTIFY_RESUME in the uprobe code was probably a workaround
for the x86 bug. With that bug fixed, we can remove _TIF_NOTIFY_RESUME
from the uprobes code.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index ad8e1bdca70e..8176caf6efd9 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1511,7 +1511,6 @@ bool uprobe_deny_signal(void) if (__fatal_signal_pending(t) || arch_uprobe_xol_was_trapped(t)) { utask->state = UTASK_SSTEP_TRAPPED; set_tsk_thread_flag(t, TIF_UPROBE); - set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); } } |